Microsoft Windows PDF Library in Windows Server 2008 R2 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows a remote code execution vulnerability when it improperly handles objects in memory, aka "Windows PDF Remote Code Execution Vulnerability".
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0293